lily/stanza-number-align-engraver.cc

   1
   2 /*
   3 stanza-number-align-engraver.cc --  implement
   4
   5 source file of the GNU LilyPond music typesetter
   6
   7 (c) 2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
   8
   9  */
  10
  11
  12 #include "context.hh"
  13 #include "engraver.hh"
  14 #include "note-head.hh"
  15 #include "lyric-extender.hh"
  16 #include "item.hh"
  17 #include "group-interface.hh"
  18 #include "side-position-interface.hh"
  19
  20
  21 class Stanza_number_align_engraver : public Engraver
  22 {
  23 public:
  24   TRANSLATOR_DECLARATIONS (Stanza_number_align_engraver);
  25
  26 protected:
  27   Link_array<Grob> lyrics_;
  28   Link_array<Grob> stanza_numbers_;
  29   virtual void acknowledge_grob (Grob_info);
  30   virtual void stop_translation_timestep ();
  31 };
  32
  33 Stanza_number_align_engraver::Stanza_number_align_engraver ()
  34 {
  35
  36 }
  37
  38 void
  39 Stanza_number_align_engraver::acknowledge_grob (Grob_info gi)
  40 {
  41   Grob *h = gi.grob_;
  42
  43   if (h->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
  44     lyrics_.push (h);
  45   else if (h->internal_has_interface (ly_symbol2scm ("stanza-number-interface")))
  46     stanza_numbers_.push (h);
  47 }
  48
  49 void
  50 Stanza_number_align_engraver::stop_translation_timestep ()
  51 {
  52   for (int i= lyrics_.size (); i--;)
  53     for (int j = stanza_numbers_.size (); j--;)
  54       Side_position_interface::add_support (stanza_numbers_[j], lyrics_[i]);
  55
  56   stanza_numbers_.clear ();
  57   lyrics_.clear ();
  58 }
  59
  60
  61 ENTER_DESCRIPTION (Stanza_number_align_engraver,
  62                   "This engraver ensures that stanza numbers are neatly aligned. ",
  63                   "",
  64                   "",
  65                   "stanza-number-interface lyric-syllable-interface ",
  66                   "",
  67                   "");
  68